//
// ViewController.m
// get异步网络请求
//
// Created by YIem on 16/3/1.
// Copyright © 2016年 YIem. All rights reserved.
//

import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

(void)viewDidLoad {

[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.view.backgroundColor = [UIColor cyanColor];
UIButton *getButton = [UIButton buttonWithType:UIButtonTypeSystem];
getButton.frame = CGRectMake(100, 100, 100, 100);
[getButton setTitle:@"get网络请求" forState:UIControlStateNormal];
[getButton addTarget:self action:@selector(getAction) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:getButton];

}

(void)getAction
{

// 网络链接
NSString *urlStr = @"http://api.map.baidu.com/place/v2/search?query=银行&region=大连&output=json&ak=6E823f587c95f0148c19993539b99295";
// 当网址中有未明字符(如中文)时进行转码
NSString *urlEncode = [urlStr stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];

NSURL *url = [NSURL URLWithString:urlEncode];
// 请求
NSURLRequest *request = [NSURLRequest requestWithURL:url];
// 配置(默认配置)
NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
// 创建请求任务, 当异步请求完成时会调用block
NSURLSessionDataTask *getTask = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
    NSMutableDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
    NSLog(@"--%@", dic);
    
}];
// 开始任务
[getTask resume];

}

(void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.

}

@end

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iOS-get异步网络请求-网络数据请求

import "ViewController.h"